BULLETIN OF THE 
USIPMMOFAiaJflit 
No. 116 
Contribution from the Bureau of Plant Industry, Wm. A. Taylor, Chief. 
June 24, 1914. 
(PROFESSIONAL PAPER.) 
NEW FACTS CONCERNING THE WHITE-PINE BLISTER RUST. 1 
By Perley Spaulding, 
Pathological Inspector, Federal Horticultural Board (formerly Pathologist, Office of 
Investigations in Forest Pathology). 
INTRODUCTION. 
In a recent publication 2 the writer gave the latest information 
regarding the white-pine blister rust up to the spring of 1913. The 
past season has brought forth several additional developments, 
which are of great importance. 
THE SITUATION AT GENEVA. 
Since 1906, when Stewart first discovered the presence of Cronar- 
tium ribicola upon Ribes at Geneva, N. Y., the disease has been 
found there in several different years. 3 This occurred in spite of the 
total destruction of the Ribes found affected in 1906 and the apparent 
absence of the secial stage of the fungus on the neighboring white 
pines. 3 In the spring of 1913 the New York State department of 
agriculture took up the matter, and a special effort was made to 
locate and examine every white-pine tree within the diseased area, 
with the result that two trees about 15 years old were found by 
Inspector Maney bearing the fruiting bodies of the fungus. They 
were promptly destroyed. These evidently had been diseased for 
a long time, probably since they were 3 or 4 years old. No definite 
i This paper is intended to supplement the previous publication, Bureau of Plant Industry Bulletin 
206, entitled "The Blister Rust of White Pine." It is, therefore, as brief as possible, and care has been 
taken not to duplicate statements made in that publication. These two bulletins are necessary in order 
to secure complete information regarding this disease. 
2 Spaulding, Perley. The present status of the white-pine blister rust. In U. S. Dept. Agr., Bur. Plant. 
Indus. Circ. 129, p. 9-20, 6 fig. 1913. 
s Stewart, F. C. Pine blister rust and currant felt rust. In West. N. Y. Hort. Soc. Proc. 58th Ann. 
Meeting, p. 122-124. 1912. 
Stewart, F. C, and .Rankin, W. H. Can Cronartium ribicola overwinter on the currant? In Phyto- 
pathology, v. 4, no. 1, p. 43. 1914. 
Jordan, W. H. Director's report for 1906. N. Y. State Agr. Exp. Sta. Bui. 284, p. 341-342. 1906. 
Director's report for 1912. N. Y. State Agr. Exp. Sta. Bui. 356, p. 559. 1912. 
Note.— This paper contains additional information concerning the white-pine blister rust that was 
collected during the season of 1913. It is of interest to foresters, tree experts, nurserymen, and owners of 
ornamental and forest plantations of 5-leaved pines . 
45612°— Bull. 116—14 
